Apache Camel Generic Router - pass exchange properties to static class methods - apache-camel

Question

I am trying to create a generic router whose processor and other attributes are populated from a static class. Here is sample code.
public class GenericRouter extends RouteBuilder( {
#Override
public void configure() throws Exception {
from("direct:generic-route")
.process(Util.getProcesss(“${exchangeProperty[processKey]"))
.ToD(Util.getUrl(“${exchangeProperty[urlKey]"));
}
}
Public class Util{
Map<String,Object> routerResources;
static {
//load routerResources
}
public static Processor getProcessor(String processorKey){
return (Processor)routerResources.get(processorKey);
}
public static Processor getUrl(String urlKey){
return (String)routerResources.get(urlKey);
}
}
The generic router is expected to post a rest call. the properties "urlKey" and "processorUrl" are already available in exchange. I finding it difficult to pass exchange properties to static Util class methods.

Answer 1

If you want to access properties of an exchange in plain java you can use .process or .exchange. If you need to access body or headers you can use e.getMessage().getBody() and e.getMessage().getHeader()
from("direct:generic-route")
.process( e -> {
String processKey = e.getProperty("processKey", String.class);
Processor processor = Util.getProcessor(processKey);
processor.process(e);
})
.setProperty("targetURL").exchange( e -> {
String urlKey = e.getProperty("urlKey", String.class);
return Util.getUrl(urlKey);
})
.toD("${exchangeProperty.targetURL}");
Also make sure you fix the return type of this method:
public static Processor getUrl(String urlKey){
return (String)routerResources.get(urlKey);
}
As a side note, you can actually use map stored in body, header or property through simple language.
public class ExampleTest extends CamelTestSupport {
#Test
public void example(){
template.sendBodyAndHeader("direct:example", null, "urlKey", "urlA");
}
#Override
protected RoutesBuilder createRouteBuilder() throws Exception {
return new RouteBuilder() {
#Override
public void configure() throws Exception {
Map<String, String> urlMap = new HashMap<>();
urlMap.put("urlA", "direct:pointA");
urlMap.put("urlB", "direct:pointB");
from("direct:example")
.setProperty("urlMap").constant(urlMap)
.log("url: ${exchangeProperty.urlMap['${headers.urlKey}']}");
}
};
}
}